I bought a brand new Johnson 150 to replace a 1989 Johnson 140hp last year. I have noticed the last time I went out, that when the steering wheel turns one revolution either way it snags, and the with a jiggle it steers again. It almost feels as if there was a gear missing in a gear box. When I push the motor while trailered it turns freely, however it still catches or snags when trailered from the steering wheel. My question** are there gears within the steering assembly, and is there a special tool that removes the steering wheel so it can be replaced....??????? Assembly is SH 5023 and it is a single helm. Thanks